<template>
  <div class="app-container">
<!--查询表单-->
<el-form :inline="true" class="demo-form-inline">
<!-- 所属分类：级联下拉列表 -->
<!-- 一级分类 -->
<el-form-item label="课程类别">
  <el-select
    v-model="searchObj.subjectParentId"
    placeholder="请选择"
    @change="subjectLevelOneChanged">
    <el-option
      v-for="subject in subjectNestedList"
      :key="subject.id"
      :label="subject.title"
      :value="subject.id"/>
  </el-select>
  <!-- 二级分类 -->
  <el-select v-model="searchObj.subjectId" placeholder="请选择">
    <el-option
      v-for="subject in subSubjectList"
      :key="subject.id"
      :label="subject.title"
      :value="subject.id"/>
  </el-select>
</el-form-item>
<!-- 标题 -->
<el-form-item>
  <el-input v-model="searchObj.title" placeholder="课程标题"/>
</el-form-item>
<!-- 讲师 -->
<el-form-item>
  <el-select
    v-model="searchObj.teacherId"
    placeholder="请选择讲师">
    <el-option
      v-for="teacher in teacherList"
      :key="teacher.id"
      :label="teacher.name"
      :value="teacher.id"/>
  </el-select>
</el-form-item>
<el-button type="primary" icon="el-icon-search" @click="fetchData()">查询</el-button>
<el-button type="default" @click="resetData()">清空</el-button>
</el-form>
<!-- 表格 -->
<el-table
  v-loading="listLoading"
  :data="list"
  element-loading-text="数据加载中"
  border
  fit
  highlight-current-row
  row-class-name="myClassList">
<el-table-column
  label="序号"
  width="70"
  align="center">
  <template slot-scope="scope">
    {{ (page - 1) * limit + scope.$index + 1 }}
  </template>
</el-table-column>
<el-table-column label="课程信息" width="470" align="center">
  <template slot-scope="scope">
    <div class="info">
      <div class="pic">
        <img :src="scope.row.cover" alt="scope.row.title" width="150px">
      </div>
      <div class="title">
        <a href="">{{ scope.row.title }}</a>
        <p>{{ scope.row.lessonNum }} </p>
      </div>
    </div>
  </template>
</el-table-column>
<el-table-column label="创建时间" align="center">
  <template slot-scope="scope">
    {{ scope.row.gmtCreate.substr(0, 10) }}
  </template>
</el-table-column>
<el-table-column label="发布时间" align="center">
  <template slot-scope="scope">
    {{ scope.row.gmtModified.substr(0, 10) }}
  </template>
</el-table-column>
<el-table-column label="价格" width="100" align="center" >
  <template slot-scope="scope">
    {{ Number(scope.row.price) === 0 ? '免费' :
    '¥' + scope.row.price.toFixed(2) }}
  </template>
</el-table-column>
<el-table-column prop="buyCount" label="付费学员" width="100" align="center"
>
  <template slot-scope="scope">
    {{ scope.row.buyCount }}人
  </template>
</el-table-column>
<el-table-column label="操作" width="150" align="center">
  <template slot-scope="scope">
    <router-link :to="'/edu/course/info/'+scope.row.id">
      <el-button type="text" size="mini" icon="el-icon-edit">编辑课程信
        息</el-button>
    </router-link>
    <router-link :to="'/edu/course/chapter/'+scope.row.id">
      <el-button type="text" size="mini" icon="el-icon-edit">编辑课程大
        纲</el-button>
    </router-link>
    <el-button type="text" size="mini" icon="el-icon-delete">删除</el-button>
  </template>
</el-table-column>
</el-table>
<!-- 分页 -->
<el-pagination
  :current-page="page"
  :page-size="limit"
  :total="total"
  style="padding: 30px 0; text-align: center;"
  layout="total, prev, pager, next, jumper"
  @current-change="fetchData"
/>
  </div>
</template>
<script>
import course from "../../../api/teacher/course"
import teacher from "../../../api/teacher/teacher"
import subject from "../../../api/teacher/subject"
export default {
  data() {
    return {
      listLoading: true, // 是否显示loading信息
      list: null, // 数据列表
      total: 0, // 总记录数
      page: 1, // 页码
      limit: 10, // 每页记录数
      searchObj: {
        subjectParentId: '',
        subjectId: '',
        title: '',
        teacherId: ''
      }, // 查询条件
      teacherList: [], // 讲师列表
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [] // 二级分类列表,
    }

  },
  created() { // 当页面加载时获取数据
    this.fetchData()
// 初始化分类列表
    this.initSubjectList()
// 获取讲师列表
    this.initTeacherList()
  },
  methods: {
    fetchData(page = 1) { // 调用api层获取数据库中的数据
      console.log('加载列表')
// 当点击分页组件的切换按钮的时候，会传输一个当前页码的参数page
// 解决分页无效问题
      this.page = page
      this.listLoading = true
      course.getPageList(this.page, this.limit, this.searchObj).then(response => {
// debugger 设置断点调试
        if (response.success === true) {
          this.list = response.data.rows
          this.total = response.data.total
        }
        this.listLoading = false
      })
    },
    initTeacherList() {
      teacher.getList().then(response => {
        this.teacherList = response.data.items
      })
    },
    initSubjectList() {
      subject.getsubJectList().then(response => {
        this.subjectNestedList = response.data.items
      })
    },
    subjectLevelOneChanged(value) {
      for (let i = 0; i < this.subjectNestedList.length; i++) {
        if (this.subjectNestedList[i].id === value) {
          this.subSubjectList = this.subjectNestedList[i].children
          this.searchObj.subjectId = ''
        }
      }
    },
    resetData() {
      this.searchObj = {}
      this.subSubjectList = [] // 二级分类列表
      this.fetchData()
    }
  }
}
</script>


<style scoped>
.myClassList .info {
  width: 450px;
  overflow: hidden;
}
.myClassList .info .pic {
  width: 150px;
  height: 90px;
  overflow: hidden;
  float: left;
}
.myClassList .info .pic a {
  display: block;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}
.myClassList .info .pic img {
  display: block;
  width: 100%;
}
.myClassList td .info .title {
  width: 280px;
  float: right;
  height: 90px;
}
.myClassList td .info .title a {
  display: block;
  height: 48px;
  line-height: 24px;
  overflow: hidden;
  color: #00baf2;
  margin-bottom: 12px;
}
.myClassList td .info .title p {
  line-height: 20px;
  margin-top: 5px;
  color: #818181;
}
</style>
